During the first phase of a fire, the oxygen concentration within the room is approximately what percent?

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Multiple Choice

During the first phase of a fire, the oxygen concentration within the room is approximately what percent?

Explanation:
Oxygen in normal room air is about 21 percent. In the early growth phase of a fire, flames consume some oxygen, but the level in the room remains close to this normal value unless ventilation is severely restricted. Hence, the best approximation for the oxygen concentration during the first phase is about 21 percent. The other values imply either more oxygen than is typical for air or a more advanced, oxygen-depleted condition that isn’t characteristic of the initial stage.

Oxygen in normal room air is about 21 percent. In the early growth phase of a fire, flames consume some oxygen, but the level in the room remains close to this normal value unless ventilation is severely restricted. Hence, the best approximation for the oxygen concentration during the first phase is about 21 percent. The other values imply either more oxygen than is typical for air or a more advanced, oxygen-depleted condition that isn’t characteristic of the initial stage.

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